Phonetics

Phonetics is the science committed to the physical investigation of the sounds of human speech, involving their production, transference, and perception. A phonetician is a person practicing the field of phonetics (Baldick, p. 192).
The science investigating the properties of human sound-making mainly sounds used in speech, supplies their description, classification, and transcription, is called phonetics. Several fields of the subject are commonly recognized: (a) articulatory phonetics (investigates the way speech sounds are made by the vocal organs); (b) acoustic phonetics (analyses the physical properties of speech sound transmitted between mouth and ear); (c) auditory phonetics (studies the perceptual response to speech sounds mediated by ear, auditory nerve, and brain).
Work in phonetics can be classified into two types:
(1) investigations of the articulation, acoustics, or perception of speech;
(2) investigations of the phonetic properties of particular languages (Crystal, p. 363).
Phonetics studies speech sounds, their physiological creation, and acoustic features.
There are two types of phonetics (Britannica Online Encyclopedia):
(3) Articulatory phonetics (analyses the vocal tract configurations used to create speech sounds).
(4) Linguistic phonetics (analyses the acoustic properties of speech sounds and the way of combining sounds to make syllables, words, and sentences.

Sources:

⠀ Chris Baldick. (2015). The Oxford Dictionary of Literary Terms. Oxford: Oxford University Press.

⠀ David Crystal. (2008). A Dictionary of Linguistics and Phonetics, 6th Edition. New-Jersey: Wiley-Blackwell.

⠀ Phonetics. Britannica Online Encyclopedia. Retrieved from: [https://www.britannica.com/science/phonetics].